Github user brennonyork commented on the pull request:
https://github.com/apache/spark/pull/7944#issuecomment-127793887
Do we need to set a default zinc port or are we assuming that either:
1. the zinc port defaults if you pass in `-port ""`
2. the `ZINC_PORT` variable will always be filled
I don't know the default behavior so just want to make sure. Was thinking
we could set the default port like `ZINC_PORT=${ZINC_PORT:-<default-port>}`.
Necessary?
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